/* Image Convolution Visualizer - Dark theme, ShareTechnote scoped */
#convContainer {
    --accent: #2ecc71;
    --bg: #1e1e1e;
    --bg-panel: #2d2d2d;
    --text: #eee;
    --border: #444;
    max-width: 1200px;
    margin: 0 auto;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--bg);
    color: var(--text);
    padding: 20px;
    border-radius: 8px;
    border: 1px solid var(--border);
}

#convContainer .conv-layout {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

#convContainer .conv-controls {
    flex: 0 0 280px;
    background: var(--bg-panel);
    padding: 20px;
    border-radius: 8px;
    border: 1px solid var(--border);
    overflow: hidden;
}

#convContainer .conv-visuals {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 20px;
    align-self: flex-start;
}

#convContainer h2, #convContainer h3 {
    color: var(--accent);
    margin-top: 0;
    margin-bottom: 12px;
}

#convContainer label {
    display: block;
    margin-bottom: 4px;
    color: #bbb;
    font-size: 0.9em;
}

#convContainer select, #convContainer input[type="range"] {
    width: 100%;
    margin-bottom: 12px;
    background: #444;
    color: var(--text);
    border: 1px solid #555;
    border-radius: 4px;
    padding: 6px 8px;
}

#convContainer .conv-file-row {
    margin-bottom: 12px;
}

#convContainer .conv-file-row input[type="file"] {
    width: 100%;
    background: #333;
    color: var(--text);
    border: 1px solid #555;
    border-radius: 4px;
    padding: 6px 8px;
    font-size: 0.9em;
    cursor: pointer;
}

#convContainer .conv-file-row input[type="file"]::file-selector-button {
    background: var(--accent);
    color: #000;
    border: none;
    padding: 4px 10px;
    border-radius: 4px;
    margin-right: 10px;
    cursor: pointer;
    font-weight: bold;
}

#convContainer .conv-dim-row {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 12px;
}

#convContainer .conv-dim-row label {
    display: inline;
    margin-bottom: 0;
    flex: 0 0 auto;
}

#convContainer .conv-dim-row #convDim {
    width: 56px;
    flex: 0 0 auto;
    background: #333;
    color: var(--text);
    border: 1px solid #555;
    border-radius: 4px;
    padding: 6px 8px;
    font-size: 14px;
    -moz-appearance: textfield;
}

#convContainer .conv-dim-row #convDim::-webkit-outer-spin-button,
#convContainer .conv-dim-row #convDim::-webkit-inner-spin-button {
    opacity: 0.5;
    filter: invert(0.7);
}

#convContainer .kernel-wrap {
    margin: 15px 0;
    padding: 10px;
    background: #1a1a1a;
    border-radius: 6px;
    border: 1px solid var(--border);
}

#convContainer .kernel-grid {
    display: grid;
    gap: 4px;
    justify-content: center;
    margin: 10px 0;
}

#convContainer .kernel-grid[data-dim="5"] {
    gap: 3px;
}

#convContainer .kernel-grid[data-dim="7"] {
    gap: 2px;
}

#convContainer .kernel-grid input {
    width: 48px;
    height: 36px;
    text-align: center;
    background: #333;
    color: #fff;
    border: 1px solid #555;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-size: 13px;
    box-sizing: border-box;
}

#convContainer .kernel-grid[data-dim="5"] input {
    width: 40px;
    height: 32px;
    font-size: 11px;
}

#convContainer .kernel-grid[data-dim="7"] input {
    width: 30px;
    height: 26px;
    font-size: 9px;
    padding: 2px 1px;
    border-radius: 3px;
}

#convContainer .kernel-grid input:focus {
    outline: none;
    border-color: var(--accent);
}

#convContainer .conv-btn {
    background: var(--accent);
    color: #000;
    border: none;
    padding: 10px 20px;
    cursor: pointer;
    font-weight: bold;
    border-radius: 4px;
    width: 100%;
    margin-top: 8px;
}

#convContainer .conv-btn:hover {
    opacity: 0.9;
}

#convContainer .conv-btn.secondary {
    background: #555;
    color: var(--text);
    margin-top: 6px;
}

#convContainer .canvas-group {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
    justify-content: center;
    align-items: flex-start;
}

#convContainer .canvas-wrap {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
}

#convContainer .canvas-wrap span {
    display: block;
    margin-bottom: 6px;
    font-size: 0.9em;
    color: #aaa;
}

#convContainer .canvas-wrap canvas {
    background: #000;
    border: 2px solid var(--border);
    cursor: crosshair;
    display: block;
    flex-shrink: 0;
    vertical-align: top;
}


#convContainer .conv-options {
    margin: 12px 0;
}

#convContainer .conv-options label {
    display: inline-flex;
    align-items: center;
    margin-right: 12px;
    cursor: pointer;
}

#convContainer .conv-options input[type="checkbox"] {
    width: auto;
    margin-right: 6px;
}

#convContainer .fft-group {
    margin-top: 15px;
}

#convContainer .fft-group .canvas-group {
    margin-top: 8px;
}